Refrigeration Operator Level 1 Practice Exam

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• What can be said about the latent heat during the phase change process?
• The three main classifications of refrigeration compressors are?
• How may positive pressure testing of a new refrigeration system be performed?
• In evaporator that can easily be cleaned and defrosted manually without interrupting the cooling process is which type of evaporator?
• What is an indication of leaking refrigerant in the primary piping?
• What is the most widely used refrigerant metering device?
• For which height are fall protection measures generally required?
• Which type of sprinkler system is the most common and easiest to maintain?
• What happens to a centrifugal chiller if water flow is interrupted?
• What is the primary function of an evaporator in a refrigeration cycle?
• How is the pressure ratio of a refrigeration compressor calculated?
• Which of the following is not a function of the refrigeration compressor?
• One Newton is equivalent to what unit?
• Heat transfer through a solid without the movement of the solid itself is called?
• What is the function of an inhibitor added to brine?
• Which substance acts as the refrigerant in a lithium bromide refrigeration system?
• Which of the following describes a characteristic of a centrifugal compressor?
• Which tests are commonly performed on a brine sample?
• What is -6°C converted to in Fahrenheit?
• Which of the following is not necessary for the safe isolation of a compression refrigeration system?
• Which component is primarily responsible for circulating fluid in a refrigeration system?
• How frequently should a brine sample be analyzed by a reputable lab?
• Which ASME section details construction files for pressure vessels?
• If crystallization occurs upon shutdown of a lithium bromide absorption system, what possible action should be taken?
• Understanding inhibitor functions in brine is crucial for what primary reason?
• In ammonia absorption systems, the weak aqua primarily functions to:
• What primary characteristic makes ammonia unsuitable for large-scale air conditioning?
• What safety control is designed to protect the chiller from freezing?
• What does latent heat cause to happen in a substance?
• If mass doubles while height remains constant, what happens to potential energy?
• What is the purpose of the pump in a lithium bromide refrigeration system's absorber?
• What is the purpose of the pump in the absorber of the lithium bromide refrigeration system?
• According to ASME BPVC Section VII, what should be used to protect heat exchangers and similar vessels?
• What is the purpose of an accumulator in a refrigeration system?
• The amount of water used in an evaporative condenser is only a small percentage of that used in a water-cooled condenser of the same capacity, because?
• What does the product 'm x g x h' represent?
• What defines any action on a body that tends to change its size, shape, or state of motion?
• How is work done on an object calculated?
• Which is generally easier to amend, a regulation or an act?
• Why are ammonia systems seldom used for air conditioning in large buildings?
• What is the force of gravity exerted on an object with a mass of 5 tonnes?
• Which component is not found on the low side of an ammonia absorption refrigeration system?
• What is defined as the rate at which a refrigeration system removes heat from the refrigerated medium?
• What role does a concentrator play in the lithium bromide absorption system?
• What does a chemical dot placed under the sight glass indicate when exposed to liquid refrigerant?
• What component is primarily responsible for regulating refrigerant flow in an HVAC system?
• What principle describes that energy will not spontaneously flow from a colder body to a hotter body?
• What determines the choice of refrigerant in a system?
• What is one of the functions of vibration absorbers in a refrigeration system?
• Why is a pump included in the absorber of the lithium bromide refrigeration system?
• In lithium bromide absorption refrigeration systems, which of the following is false?
• What is the employer's responsibility regarding personal protective equipment?
• What is required to lower the boiling point of the refrigerant in a lithium bromide refrigeration system?
• What are the four basic components of WHMIS?
• When an ammonia compressor has been pumped down below atmospheric pressure, what care must be exercised?
• What is the function of the evaporator in a refrigeration system?
• What is the purpose of the safety head in a refrigeration compressor?
• When comparing compression and absorption refrigeration systems, which statement is true?
• Before operating a new refrigeration plant, what must be tested?
• In absorption refrigeration systems, what components fulfill the functions typically handled by compressors in compression systems?
• What effect does a liquid refrigerant control valve have on the system?
• What element is NOT included in safe operating procedures for draining oil from an ammonia refrigeration system?
• If ammonia is detected in the brine solution, when should it be addressed?
• What is the purpose of pumping down a compression refrigeration system?
• What identifies the freezing temperature of a brine solution?
• Which of the following represents an example of loss of latent heat?
• What is the main benefit of regular maintenance on refrigeration systems?
• In the first law of thermodynamics, heat supplied equals the increase in internal energy plus what?
• A force that causes an object to change its motion is known as what?
• Which of the following statements is true about oil pots?
• What does the low oil pressure cut-off switch do in a mechanical refrigeration system?
• What is a critical cause of electrical fires in buildings?
• Which device helps to shut down the compressor under low refrigerant conditions?
• Which of the following is NOT a type of heat exchanger?
• The saturation temperature of a refrigerant corresponds to what property?
• If ammonia is detected in the brine solution, when should it be addressed?
• What type of energy is associated with the motion of a body?
• In a refrigeration system that circulates warm brine back to a chiller, which statement is correct?
• What kind of refrigerant is known for being environmentally friendly?
• Which statement about strainers in refrigeration systems is false?
• What is the primary purpose of an expansion valve in a refrigeration system?
• In the lithium bromide absorption refrigeration system, what is the main function of the generator?
• In a refrigeration cycle, where does the refrigerant undergo phase change from liquid to gas?
• How can the boiling point of a liquid in a closed vessel be increased?
• What is used as the absorbent in an Ammonia Absorption System?
• What is the primary purpose of a refrigeration compressor?
• Which physical law explains that energy within a closed system remains constant?
• What type of brine is commonly used for skating and hockey rinks?
• What is a common use for the heat generated in a lithium bromide system?
• Which element is not included in the safe operating procedure for draining oil from an ammonia refrigeration system?
• What does the ignition temperature of a fuel/air mixture refer to?
• Which statement about the shell and tube evaporator is false?
• What is the main function of the concentrator in a lithium bromide refrigeration system?
• What does Section 7 of the CSA B52 refrigeration code cover?
• Oil build-up in a refrigeration system will typically result in what?
• The transfer of heat that involves the movement of a fluid is known as what?
• What is the purpose of an oil separator in a refrigeration system?
• What qualities are desirable in an ideal refrigerant?
• A sulphur candle is used to test for which type of leaks?
• When the temperature of an object is increased, its change in length is proportional to what?
• Why may a compression refrigeration system need to be pumped down?
• Which statement is true regarding the economizer of a packaged water chiller?
• In a lithium bromide refrigeration system, what is the role of the concentrator (generator)?
• When the temperature of an object is raised, its increase in surface area is proportional to which of the following?
• If a body travels 850m in 34 seconds, what is its average velocity in km/h?
• How much work is done by a pump with a 0.1m diameter piston, travelling 250mm against a pressure of 1500kPa?
• What is the purpose of the safety head in a refrigeration compressor?
• Which of the following is not considered a physical property of refrigerants?
• What role does the expansion valve play in a refrigeration system?
• What happens to the refrigerant in the evaporator?
• What are the three main classifications of refrigeration compressors?
• Which section of CSA B52 contains information on refrigerant classification?
• In an ammonia absorption system, what is absorbed by the weak aqua?
• What process occurs when a liquid turns into a gas?
• Why are ammonia systems rarely used for air conditioning in large buildings?
• According to the second law of thermodynamics, heat will flow unaided from which type of body?
• What is the role of the expansion valve in a refrigeration system?
• What is the function of a rotating mechanical seal in a refrigeration compressor?
• True or False: With the exception of water, all liquids expand in direct proportion to their change in temperature when heated.
• In which component of a refrigeration system does the liquid refrigerant change to gas?
• When should maintenance be performed on the low-pressure side of a refrigeration system?
• In a lithium bromide refrigeration system, which substance acts as the refrigerant?
• Which refrigerant type is commonly used in centrifugal compressors?
• The "flash point" of a flammable liquid is defined as:
• If a pump raises 650 tonnes of sea water a height of 55 m in 6 hours, what is the power required to drive the pump at 100% efficiency?
• What impact does system friction have in a refrigeration cycle?
• What is a primary purpose of a liquid refrigerant control or regulating valve?
• What happens if the pressure ratio of a compressor is too high?
• What causes a gradual pressure drop in a refrigeration system?
• Which of the following is an indication of an ammonia leak in a refrigeration system?
• What happens to refrigerant during condensation?
• Which condition increases the efficiency of lithium bromide absorption systems?
• Who bears individual responsibility for health and safety in a workspace?
• Which of the following is not an advantage of a factory assembled, packaged refrigeration unit?
• Why is it essential to analyze brine samples regularly?
• Where is the initial refrigerant charge added in a refrigeration system?
• In the condenser of a refrigeration system, what is the primary role of the condensing medium?
• Which process results in the cooling effect in a refrigeration system?
• What is the SI unit of measure for energy?
• What is one of the main purposes of the CSA B-52 code?
• To effectively lower the boiling point of refrigerant in a lithium bromide refrigeration system, what is essential?
• A direct expansion type evaporator with multiple refrigerant circuits requires what to ensure even refrigerant flow?
• At which temperature is it said that all molecular motion completely ceases?
• What happens to a refrigeration system if its efficiency is reduced due to oil build-up?
• Refrigerant compressors could be which of the following types?
• When does an object have maximum potential energy?
• How is a "confined space" defined by the chapter?
• The change of position per unit time is referred to as what?
• What is the primary function of a chiller's flow switch?
• What is the primary use of excess water heat in absorption refrigeration systems?
• In an ammonia absorption refrigeration system, what is used as the absorbent?
• Which process utilizes the heat from waste energy in absorption refrigeration?
• Which of the following is not a component of a closed cycle compression refrigeration system?
• What term is used to refer to the provinces and territories of Canada in legal contexts?
• What ensures that a centrifugal compressor starts only under no-load conditions?
• If the chilled water temperature drops approximately 2.5-3°C below the control thermostat set point, what will happen?
• In absorption refrigeration systems, waste is typically used to achieve which process?
• Which national standard has been adopted by jurisdictions in Canada as part of their applicable Act and/or Regulations?
• What is the main function of refrigerant condensers?
• What regulation lists requirements to qualify for jurisdictional examinations?
• What type of refrigerant compressors could be utilized in refrigeration systems?
• What must be supplied to transfer heat from a colder substance to a hotter substance according to the second law of thermodynamics?
• What happens when the chilled water temperature rises about 5 to 6°C above the set point after a low water temperature stop?
• What is primarily affected by the efficiency of a refrigeration compressor?
• What is the potential energy of a 95kg object at a height of 36m above the ground?
• All acts will have all of the following features except:
• How do absorption refrigeration systems utilize waste heat?
• What is the most vital element to ensure effective heat transfer in a fin-type heat exchanger coil?
• The CSA B52 code requires what type of devices shall be provided on all states operating above atmospheric pressure?
• Which component is essential for the removal of heat in a refrigeration system?
• What is a characteristic feature of lithium bromide solution in a refrigeration system?
• What occurs when a liquid evaporates?
• What is the role of the brine pump in a refrigeration system?
• Which ASME code outlines refrigeration piping and heat transfer components?
• What can moisture in a refrigeration system lead to?
• What method of heat transfer occurs when heat flows from molecule to molecule within a substance?
• In an ammonia absorption refrigeration system, which ammonia form is absorbed by aqua?
• Before operating a new refrigeration plant, the system must be tested for what?
• Which process is essential for maintaining lithium bromide system effectiveness?
• In what scenario is a cooling tower typically utilized?
• In a lithium bromide system, how does the concentrator enhance system performance?
• What is typically used to analyze the condition of refrigerant being used in a system?
• Which statement about automatic expansion valves is false?
• Which of the following is not considered a rotary refrigeration compressor design?
• Which type of heat exchanger is not usually used with steam because condensate does not easily drain from them?
• Which statement about lithium bromide absorption systems is incorrect?
• What is the maximum allowable pressure increase above the relief setting in a refrigeration system?
• When an ammonia compression system is pumped down below atmospheric pressure, what precaution must be taken?
• Which of the following is not a function of the refrigeration compressor?
• The unit of energy equivalent to the ability to do work is called?
• What is the equivalent of 1 psi in kPa?
• What is the primary mode of heat transfer in a vacuum?
• Most boiler tubes function as which type of heat exchangers?
• In a lithium bromide refrigeration system, what type of lithium bromide solution is capable of absorbing water vapor readily?
• What does the specific gravity of a brine sample indicate?
• A high level of iron in the brine system indicates what?
• What is true about R-134a refrigerant?
• In heat exchangers, which element is primarily responsible for moving the heat?
• Which group meets at least annually to ensure that Power Engineer examinations meet jurisdictional standards?